Road-building machine



1927. March 1 F. M. HARGRAVE ROAD BUILDING MACHINE TTORNEY.

' 7 Filed t. 1 1925 12 Sheets-Sheet Z? flfla'ly am; BY

March 1,192)? 1,619,614

F. M. HARGRAVE ROAD BUILDING MACHINE Filed Sept. 15, 1925 12 sheets sheet 2 1 Wk/grave;

A TT RNEY.

ar h l 1927. M c F. M. HARGRAVE ROAb BUILDING MACHINE Filed Se t. 15. 1925 12 Sheets-Sheet s March 1 1927.

F. M. HARGRAVE ROAD BUILDING MACHINE Filed Sept. 1925 12 Sheets-Sheet 4 INVENTOR.

March 1 1927. 1,619,614

F. M. HARGRAVE ROAD BUILDING MACHINE Filed Sept. 15, 1925 12 Sheets-Sheet 5 Q imam? March 1 1927.

F. M. HARGRAVE ROAD BUILDING MACHINE Filed Sept. 1 1925 12 Sheets-Sheet 6 1,619,614 Much I 1927' F. M. HARGRAVE ROAD BUILDING MACHINE led .1 1925 12 Sheets-Sheet 7 INV EN TOR.

HIE/grave,

W ATTORNEY March 1,1927. v F. M. HARGRAVE ROAD BUILDING MACHINE Filed S p 1925 12 Sheets-Sheet 8 ATTORNEY.

Filed Sept 1 1925 12 sneetswsheet 9 ATTORNEY.

7 1,619,614 March 1927' F. M. HARGRAVE ROAD BUILDING MACHINE March 1 1927. 1,619,614

F. M. HARGRAVE ROAD BUILDING MACHINE Filed Sept. l 1925 12 Sheets-Sheet 11 i "/Yfiavyrawgmmm.

, ATTORNEY.

1,619,614 Mafch 1 1927' F. M. HARGRAYE ROAD BUILDING MACHINE t. 15, 1925 12 Sheets-Sheet 12 Filed BY W ATTORNEY.

Patented Mar. 1, 1927.

UNITED STATES FRED MERRILL I'IARGRAVE, F CEDAR RAPIDS, IOWA.

ROAD-BUILDIN G MACHINE.

Application filed September 15, 1925. Serial No. 56,508.

This invention relates to a road building machine, and has for its object to provide, in a manner as hereinafter set forth, a machine of such class for smoothing, dressing, grading, planing or scarifying a road, highway or pavement, as well as to break pavement or road surfacing for trenches.

Further objects of the invention are to provide, in a manner as hereinafter set forth, a machine of such class which is com paratively simple in its construction and arrangement, strong, durable, thoroughly efiicient in its use, conveniently adjusted, and comparatively inexpensive to set up.

iVith the foregoing and other objects in view the invention consists of the novel construction, combination and arrangement of parts as hereinafter more specifically de scribed, and illustrated in the accompanying drawings, wherein is shown an embodiment of aroad building machine, in accord ance with this invention, but it is to be understood that changes, variations and modifications can be resorted to which fall withr in the'scope of the claims hereunto appended. In the drawings wherein like reference characters denote corresponding parts throughout the several views I Figures 1 and 1 when taken together, illustrate in top plan, a road building machine in accordance with this invention.

Figures 2 and 2 when taken together, illustrate in side elevation. a road building machine in accordance with this invention. Figure 3 is a section on line 33 Figure 1, illustrating the mechanism to shatter, break, hammer, chisel or loosen the road or surfacing material from the existing surface down to a predetermined level and at a predetermined cross section of the street, road way or pavement.

Figure 4 is a section on line 4t& Figure 1, illust'ating the mechanism referred to with respect to Figure 3 and further illustrating the front portion of the machine.

Figure'o is a section on line 5-5 Figure 4.

Figure 6, is'asection on line 66 Figure 4.

Figures 7 and 8 are disassembled views in plan respectively of upper and lower frame plates of the mechanism referred to in Figure 8 and further showing the top and bottom guide plates associating with each of said frame plates.

Figure 9 is a section on line 9-9 Figure 1 illustrating the mechanism for cutting or tearing up the upper layer of a pavement or road surface.

Figure 10 is a section on line 10-10 Figure 9.

Figure 11 is a fragmentary view, in side elevation, illustrating one of the cleaners forming a part of the cutting or tearing up mechanism.

Figure 12 is a fragmentary view, in plan, of one of the suspension rods for the support for the scrapers of the mechanism shown in Figure 9.

Figure 13 is a section on line 1313 Figure 1 illustrating the planer or scarifying mechanism.

Figure 14 is a section on line 1414, Figure 13.

Figure is a section on line 1515 Figure 1 A machine in accordance with this invention comprises a mobile support including wheels and runners, a unit or mechanism for breakingor loosening the surfacing materiahof a street, roadway or pavement to a pre-determinedlevel and at a pre-determined cross section, a unit or mechanism for cutting the upper layer of a street, roadway or pavement, and a planer or scarifying unit or mechanism for planing or scarifying the surface of the street, roadway or pavement.

The several units or mechanisms are mounted on the mobile support, operated simultaneously or each may be operated independently. The machine is portable and certain of, the units are designed to operate when the machine is either stationary and others only when in motion. The mobile support may be either self-propelled or operated as a trailer behind a tractor, truck or other motive power. In either case the mobile support carries a power unit of sutfieient capacity to propel such units as are hereinafter described requiring other power than traction.

The mobile support comprises a frame formed of an upper and a lower section referred to generally by the reference characters 1.2, respectively. The section 1 is arranged above the section 2, is spaced therefrom and further projects forwardly thereof. The upper section consists of a pair of oppositely disposed channel irons 3, 4:, braced and connected together by spaced I-beams 5 and llt 6. The beams 5 and 6 are secured to the inner faces of the channel irons 3, 4. The beam 5 by the angle pieces 8, 9 are respectively in connection with the holdfast devices 10. The beam 6 by the angle pieces 11 in connection with the holdfast devices 12. Angle pieces 13 are also secured to the beam 6 by holdfast devices 14. The angle pieces 13 have their horizontal legs spaced from the channel irons 3, 4 and project rearwardly from the beam 6. i-krranged against the inner face of each of the channel irons 3, 4 at the rear thereof is a vertically disposed fiat support 15 which has its forward edge abutting against the beam 6 and overlapped by the horizontal leg of an angle piece 13. The support 15 is flush at its top edge with the top of a channel iron and is interposed between an end of the beam 7 and a channel iron. The supports 15 depending a substantial distance below the channel irons are secured to the lower section 1, in a manner as hereinafter referred to. The supports 15 further constitute means for maintaining the sections 1, 2 in spaced relation. Secured to the inner face of each of the supports lengthwise thereof is an angle shaped brace member 19. The hor izontal legs of the angle pieces 13 are connected to the supports 15 by the holdfast devices 20.

The lower section 2, is of materially greater length than the section 1, and as each side thereof is of like construction, but one will be described as the description of one will apply to the other. Each side of the section comprises a top member 21 formed from an elongated angle bar of inverted L-shape in cross section and a bottom member 22 formed from a pair of spaced oppositely disposed angle bars having the forward portions curving upwardly as at 23.

22 is arranged in edge alignment with the lower edge of each vertical leg of a top member 21. The members when set up are of the same length. Arranged between the rear end terminal portions of the top members 21, and depending below the same, is a channelshaped brace member 24, which is secured in position by angle pieces 25 and holdfast de vices 26. The vertical leg of each top mem ber 21 is connected to the vertical webs of the bars of each bottom member 22 by an elongated flat plate 27, standing on edge. in connection with the holdfast devices 28, 23. Each plate 27 extends between the bars of a bottom member. Each top member is socured to a bottom member by vertically dis posed, spaced combined bracing and spacing strips 29 and holdfast devices 30.

The lower face of each of the bottom men:- bers 22 throughout has secured thereto a shoe 31 having an upturned forward end.

The sections 1 and 2 are connected together The vertical web of the outer of the bars of each bottom member by the supports 15 which extend below the bars 21 and have their forward lower corners secured by the holdfast devices 30 to the upturned forward ends of the vertical webs of the bars 22. The supports 15 are positioned against the inner faces of the members 21 and the plates 27 and are secured thereto by the holdfast devices 31. Arranged between the lower portions of the supports 15 is a bracing element in the form of an I-beam 7, and which is secured in position by the angle pieces 17 and holdfast devices 18.

Front truck which forms an element of the mobile support and is best shown in Figures 2, 4 and 5. This truck comprising a. vertically disposed casting 32 forming what may be termed a combined adjusting element holder and king pin housing and guide. The casing is formed of a square upper portion 33 and a tapered lower portion 34. The upper portion 33 is arranged between and extends above the beams 5 and 6, centrally thereof. The forward and rear faces of the portion 33 are provided respectively with pairs of superposed spaced grooves 35, 36 for the re ception of the rear flanges 37 of the beam 5 and the forward flanges 38 of the beam 6. The portion 33 is secured to the beams 5 and 6, by the holdfast devices 39 which are spaced from the grooves 35, 36.

he casting 32 is formed with a vertical opening 40 and a vertical socket 41 of greater diameter than the socket. The opening is arranged in alignment and communicates with the upper end of the socket 41. The

opening and socket are disposed forward of the vertical median of the casting 32. The opening is of less length than the length of the socket and formed solely in the portion 33, while the socket 41 is formed in the lower part of the portion 33, extends entirely through the portion 34 and opens at the lower end thereof. The wall of the opening 40 is threaded throughout and engaging therewith an adjusting screw 42 for vertically adjustingthe forward end of the mobile support. The screw 42 extends above the casting 32 and is provided with a hand wheel 43. The screw 42 is also adapted to extend into the socket 41 and cooperate with a king pin 44 to provide for the vertical adjustment of the forward end of mobile support. The socket provides a housing for the king pin 44, and the wall thereof forms a bearing for the latter. The king pin 44 depends below the portion 34 of the casting 32.

Arranged below casting 32 is the axle of the truck referred to generally by reference character 45 and which is formed with a polygonal shaped intermediate portion 46 and a. pair of cylindrical outer end portions each provided with an inner part 47, an intermediate part 48 and an outer part 49. Upon the intermediate part 48 is mounted a front wheel 50. The part 47 is of greater diameter than the part 48 and the latter is of greater diameter than the part 4.9. A washer 51 is mounted on part 49 at the outside of the wheel 47 and in connection with the part 47 confines the wheel on the part- 48. A cotter pin 52 extends through the part 49 for maintaining the washer 51 thereon.

Mounted on the intermediate part 46 of the axle 45 is a saddle comprising an inverted V -shaped body portion 53 of the same length as the intern'iediate portion 46. The body portion 52 is provided with a pair of oppositely disposed lengthwise extending sets ofspaced apertured lugs 53. Formed integral with the body portions 52 and centrally thereof, is a yoke-shaped vertically disposed extension provided with opposed openings 55. Arranged in superposed relation with respect to the extension 54 is an in verted yoke 56 having its top formed with an opening 57 and its arms with openings 58 aligning with the openings 55. The king pin 44 extends through the opening 57 and into the extension 54 and is pivotallv connected to the latter and. to the yoke 56 by a pin 59, which extends through the aligning openings and 58 and also through an opening in the lower end of the pin 44. The pin 59 projects from each side of the yoke 56 and is provided with a washer 60 and a cotter pin 62 for the purpose of connecting the king pin 44. yoke 56 and extension 54 together to provide for the pivoting of the lower end of the king pin 44. The lower end of the king pin 44 is curved as at 63.

The saddle is fixedly secured to the intermediate part 46 of the front axle 45 by means of spaced V-shaped tie bolts 64. each of which overlaps the lower part of the intermediate portion 46 of the axle and extends through lugs 53 and carries clamping nuts 65 on the upper ends thereof.

The construction and arrangement of the front truck is such. that when the adjusting element or screw 42 is moved downwardly the forward end of the mobile support will be elevated, through the engagement of the screw 42 with the upper end of the king pin 44. Vhen the screw 42 is moved upwardly the forward end of the mobile sup port will be lowered.

The rear truck forms an element of the mobile support and is best shown in Fig ures 1 and 15. This truck comprises the rear axle 66. upon which the rear wheels 67 are mounted. The axle 66 is vertically adjustable and the adjusting means for said axle 66 is connected to each end thereof. and as the means connected to one end of the axle 66, is the same as that connected to the other end thereof. but one will be described as the description of one will apply to the other. Secured to the inner face at the lower portion of a plate 27, by holdfast devices, and positioned on the inner bar of a bottom member 22, as well as overlapping the vertical web or leg of the said inner bar, is a combined supporting and journal block 68. The holdfast devices for securing the block in position are indicated at 69. Secured to the inner face of the plate 27, and resting on the block 68, is a pair of vertically extending uprights 70, 71 of angleshape in plan and each of which is so arranged that one of the legs or arms thereof will be positioned against the inner face of the plate 27 and the other arm or leg thereof will extend inwardly at right angles with respect to said plate. The arms of the uprights 70 71 which extend inwardly atright angles to the plate 27 are indicated at 73. The arms 7 3 project beyond the inner side of the block 68. The supports 70 and 71 project a substantial distance above the top member 21 and between the upper ends there of is secured by the holdfast devices 74 a bearing block 7 5 provided with a vertically disposed opening 76. Arranged between the legs 7 3 of the supports below the block 75 is a combined elevating and journal block element for the axle 66. The said element comprises a rectangular body portion formed of a high part 77 and a low part 78 which is arranged inwardly with respect to the part 77 and is formed in its upper face with a semi-circular groove 79. The part 7 7 extends above the part 78 and is formed with a vertically disposed opening 80 having the wall thereof threaded throughout. Fixedly secured to the part 7 8, by holdfast devices 81 is a cap piece 82 having its lower face formed with a semi-circular groove 83 and said cap piece 82, in connection with the part 78. provides a journal block for one end of the axle 66. Extending through the bearing block 7 5, and having thread-ed engagement with the wall of the opening 80 and further journaled in the block 68 is an adjusting shaft for the combined elevating and journal. block element. The adjusting shaft is referred to generally by the reference character 84 and includes an upper plane portion 85, a threaded intermediate portion 86 and a plane lower portion 87 of less diameter than the upper portion and said lower portion 87 is journaled in a socket 89 formed within the block 68. The intern'iediate portion 86 has threaded engagen'ient with the threads of the wall of the opening 80. The upper portion 85 extends through the opening 76 and above the block 75 and has its upper end provided with a worm pinion 90. The shaft 84 is furthermore provided between the portions 85 and 86 vith a stop collar or boss 91. which abuts against the lower face of the block 75 for limiting the upward movement of the shaft 84.

The legs or arms of the supports 70, 71, which are secured to the plate 27 and extend at right angles to the legs or arms 7 3 have fixedly secured to the upper portions thereof, by the holdfast devices 92, an out vardly extending supporting bracket 73, having fixed to its upper face a bearing ele ment SH; and which is disposed at right angles with respect to the shaft 84.

Mounted in each of the bearings 94, and extending transversely with respect to the section 2 of the frame of the mobile support, is an operating shaft 95 provided with a pair of worms 96, which mesh with the worm pinions 90 and when said shaft 95 is operated in one direction, it will cause a simultaneous operation of the adjusting shafts 84 in a direction to elevate the aXle 66, and when shaft 95 is revolved in the op posite direction it will provide for the operation of the shafts 84; in a direction to lower the axle 66. When the axle 66 is elevated the rear end portion of the mobile support is lowered. When the axle 66 is lowered the said portion of the mobile support is elevated. The shaft 95 is extended from one of the bearings 9 and provided with a hand wheel 97.

The adjustment of the mobile support is to govern the depth to which the different units of the machine may penetrate into road, highway or pavement surface. hen the machine is being propelled forward or backward over the road or street surface the elevation of all wheels is sufficient so that the frame work is held up off the pavement surface, whatever the distance within the limits of the machine is desired by the operator. By providing the sides of the machine with shoes they serve as runners in case one of the wheels drops into a depression in the street or road surface until the frame work comes in contact with said surface. The wheel base or distance between the front and rear wheels is long enough to reduce to a minimum the effect on the elevation of each or any unit of the machine when one wheel drops into a hole or depression. This characteristic, when combined with the fact that each separate unit or mechanism of the machine is also vertically adjustable on the frame of the mobile support, provides for the absolute control of the depth of treatment of the road surface possible from each and every unit or mechanism of the machine. If desired. the shoes may be provided with rollers, to reduce tractive resistance.

The machine includes a mechanism to shatter, break, hammer, chisel or loosen the road or surfacing material from the existing surface down to a predetermined level and at a 'n'edetermined cross section of the street, roadway or pavement. This mechanism will be hereinafter termed surface breaking or loosening mechanism and it is best shown in Figures 1, 2, 3, 4-, 7 and 8.

It is the purpose of this loosening mechanism or unit, by means of two batteries of vertically mounted hammers, drills, tampers, bars, chisel's, or similar devices to shatter, break, hammer, chisel or loosen the road or surfacing material. from the existing surface down to a pre-determined level and at a pre-determined cross section of the street, roadway or pavement. This mechanism may be operated with the entire machine stationary or in motion. The theory of its operation is that when the speed of the machine over the surface is as designed and rated for the particularmachine, the batteries of chisels or of similar tools or instruments held firmly in a vertical position by guides will be moved upward against high tension spiral springs, either conical or helical, by a cam on a rotating cam shaft operated at a reasonably high speed so that when each cam releases its chisel or similar tool it will be forcefully propelled downward by the combined forces of the spring and gravity until the lower end of the chisel or similar tool comes in contact with the pavement or roadway surface. Or, if the chisel is over a depression so that its end does not come in contact with the said surface its impact will be absorbed by a pair of resisting springs so designed as to slow up the chisel without; damage or shock to the machine. The machine may have one, two or more batteries of these chisels, each battery operating in sequence from end to end so that only one chisel or tool strikes the ground at a time in each battery and only one cam is at its maximum load and position at one time. It is thought unnecessary to show a plurality of batteries, as the description of one would apply to the other and it is obvious that the operating means for several batteries would be the same, so as to provide for operating in proper sequence. By adjusting the spacing and number of individual chisels, and bat teries of chisels in accordance with the proposed longitudinal speed in propelling the entire machine, substantially every square inch of road surface or pavement will receive at least one blow from the chisel or other tool. When more than one battery of chisels or other tools is used the cam shafts propelling the said tools are geared together so that they operate at the same speed. The entire unit is propelled by a power unit or prime mover of a horse power in keeping with the size of the particular machine. The unit or mechanism is adjustable vertically so that the depth to which the chisel or other tool would penetrate may be governed and the force of impact on any one machine may be varied by adjusting the elevation of the unit with relation to the surface under treatment.

The surface loosening mechanism will now be specifically described and comprises a top frame plate 98 of rectangular contour havslots 103.

ing arranged at its longitudinal median a pair of oppositely extending rectangular project-ions 99, 100 at the end edges thereof and each of said projections is formed centrally with an opening 101 and further with pairs of openings 102. The forward side marginal portion of the plate 98 is formed with a series of transversely extending spaced slots 103 open at the forward ends thereof. The slots 103 provide clearances for the vertical movement of one set of tools forming elements of the mechanism and as illustrated the number of slots is eight, but this number can be increased or diminished, depending upon the number of tools forming the set. The rear side marginal portion of the plate 98 is formed with a series of transversely extending spaced slots 104 open at the rear ends thereof. The slots 104 provide clearances for the vertical movement of another set of tools forming elements of the mechanism. The number of slots 104 correspond with the number of slots 103. The slots 104 are staggered with respect to the The slots 103 are spaced equidistant apart with respect to each other and all the slots 104 with the xception of one, are spaced equi-distant apart, the slot spaced the greater distance is indicated at 105, and is one of the end slots of the .series of slots.

Arranged below and spaced from the plate 98, is the bottom frame plate 106 and which is constructed in the same manner as the plate 98, with this exception that the plate 106 is not provided with the projections 99, 100. The forward set of slots formed in the plate 106 is indicated at 107, and the rear set of slots at 108. The slots 103 are arranged in vertical alignment with the slots 107 and the slots 104 are arranged in vertical alignment with the slots 108.

Secured to the upper face of the plate 98 and extending across the set of slots 103 is a top drill guide and bracket plate 109 having its rear edge formed with spaced grooved notches 110 which constitute closures for the slots 103. The openings 111 are provided in the plates 98 and 109 for the passage of holdfast devices to secure the plates together. Mounted on the plate 98 and extending across the set of slots 104, which includes the slots 105, is a top drill guide and bracket plate 112 having its forward edge provided with notches 113 for closing the slots with which said plate 112 is associated. Openings 114 are provided in the plates 98 and 112 for the passage of holdfast devices to secure the plates together.

Mounted against the lower face of the plate 106, and extending across the set of slots 107, is a bottom drill guide plate 115 having its rear edge provided with notches 116 constituting closures for the slots 107. Openings 117 are provided in the plates 106 and 115 for the passage of holdfast devices to secure the plates together. Mounted against the lower face of the plate 106 and extending across the slots 108 is a bottom drill guide plate 118 having its forward edge provided with notches 119 which close the open ends of the slots 108. Openings 120 are provided in the plates 106 and 118 for the passage of holdfast devices to connect the plates together. The plates 98, 109 and 112 are detachably connected together and this arrangement applies to the plates 106, 115 and 118.

Arranged between the plates 98 and 106 and spaced between the longitudinal center and the side edges thereof is a pair of I- beams 121, 122 having their flanges fixedly secured to the plates 98 and 106 by holdfast devices 123. Openings 124 are provided in the plates 98 and 106 for the passage of the holdfast devices. The plates 109, 112, 115 and 118 are provided with sets of openings 125, 126, 127 and 128 respectively. The openings of the set 125 register with the slots 103. The openings in the set 126 register with the slots 104, which includes the slot 105. The openings 127 register with the slots 107 and the openings 128 register with the slots 108. Associated with each opening 125 and formed in the plate 98 is a pair of openings 129. Associated with each opening 126 and formed in the plate 98 is a pair of openings 130. Associated with each opening 127 and formed in the plate 106 is a pair of openings 131 and associated wit-h each opening 128 formed in the plate 106 is a pair of openings 132.

When the plate 109 is secured in position, the openings 125 align with the openings 127 and the openings 129 align with the openings 131. When the plate 112 is secured in position the openings 126 align with the openings 128 and the openings 130 align with the openings 132. The openings 125 and 127 are provided for the passage of bolts 133 which are connected with the plates 109 and 115 and extend through the slots 103 and 107. The openings 129 and 131 are provided for the passage of bolts 134 which are connected to the plates 98 and 106. The openings 126 and 128 are provided for the passage of bolts 135 which are connected to the plates 112 and 118 and extend through the slots 104 and 108. The openings 130 and 132 are provided for the passage of bolts 136 which are connected to the plates 98 and 106.

A belt 133, in connection with a pair of bolts 134 or a bolt 135 in connection with a pair of bolts 136 confines between the plates 98 and 106 a compression spring 137 and a pair of buffer springs 138, 138, which are arranged below the spring 137 and separated theretrom by a split collar 139 clamped to a drill or other tool 140, and positioned against said collar 139 is a pair of washers 141 and 142. The compression spring 137 is interposed between the plate 98 and the washer 141 and the buffer springs are interppged between the plates 106 and the washer Arranged between the plates 98 and 106, at the ends thereof as well as secured there with by holdfast devices 143 extending through openings 102 in the plate 98 and openings 145 in the plate 106 is an elevating block. As each of the elevating blocks are of the same construction, but one will be described, as the description of one will apply to the other. The elevating blocks are oppositely disposed with respect to each other and each comprises an inner portion 146 and an outer portion 147 of less height than the former. The holdfast devices 143 engage in the inner portion 146 of the elevating block. The outer portion 147 is not only of less height than the inner portion 146, but of less length than the length of the latter, and is centrally disposed with respect to the outer face of the inner portion 146. The outer portion 147 is of the same size as the projection 99 or 100 formed 011 the plate 98 and the projection is seated on the top of the outer portion 147, of the elevating block, as well as being secured therewith by holdfast devices 148 which extend through the openings 102 in the projection. The outer part 147 is formed centrally with a vertically disposed opening 149 having the walls thereof threaded throughout and said opening 149 registers with the opening 101 in a projection 99 or 100. The threaded walls of the openings 149 of the elevating blocks are engaged by threaded elements, capable when operated, of vertically adjusting the elevating blocks for the purpose of elevating and lowering the surface loosening mechanism.

Secured to the inner face of the plate 27 of each of the side members of the section 2 is a combined support and bearing block 150, arranged in alignment with respect to the other portion 147 of an elevating block, as well as below said portion 147, and said block 150 is provided with a vertically disosed socket, 51 opening in the top of the lock.

Secured to the inner face of the plate 27 of each of the side members of the section 2 of the frame of the mobile support is a pair of oppositely disposed vertically extending angle-shaped supporting members 152, 153, and between each pair of which is arranged a block 150, and extending in each pair of supports is the outer portion .147 of an elevating block and the said pair of supports constitutes a guide for the part 147 during the vertical movement of the elevating block. The elevating blocks are simultaneously shifted and the means to provide for such operation will be presently referred to. Each pair of supports extend a substantial distance above the section 2 of the frame of the mobile support and between the upper ends of each pair of supports 152, 153 a bearing block 154 is fixedly secured. The block 154 has a vertically disposed opening 155. Extending through the opening 155 and through the opening 148 and into the socket 151 is an adjusting element for vertically moving an elevating block, and as each of the ad usting elements is of the same construction, but one will be described, as the description of one will apply to the other. Each of the adjusting elements is in the form of a vertically disposed shaft referred to generally by the reference character 156 and consisting of 'a plane lower terminal portion 157 engaging in the socket 151, a threaded intermediate portion 158 which engages with the threads of the wall of the opening 148 and of materially greater length than the height of said opening 148, an upper plane portion 159 which extends through the opening 155 and is provided with a collar or boss 160 abutting against the lower face of the block 154, and has extended therefrom a stem 161 for the reception of the hand wheel 162 to facilitate the revolving of the shaft 156.

To provide for the simultaneous operation of the shafts 156 for the purpose of simultaneously elevating and lowering the elevating blocks, each of the shafts 156 above a block 154 is provided with a beveled pinion 163, meshing with a beveled pinion 164 carried on the rear end of a counter shaft 165. Secured to the upper end of the support 153 is a bearing bracket 166 for the rear end of the shaft 165. Arranged forwardly of the bracket 166 and secured to each side of the section 2 of the frame of the mobile support, is a vertically disposed standard 167 carrying a supporting bracket 168 at its upper end and upon which is secured a bearing 169 for the forward end of the shaft 165 and the latter projects forwardly from the bearing 169 and carries a sprocket wheel 170. Gonnected to and operated by the sprocket wheels 170 is a transversely extending belt 171 of the link type. By the construction and arrangement of the parts as referred to, when either one of the shafts 156 is revolved, the bevel gear connection between the shafts will provide for the simultaneous operation thereof under such conditions vertically adj usting the elevating blocks.

Secured to the plate 98 in proximity to one end thereof is a transversely extending I-beam 172 and secured to the upper face of the plate 98, in proximity to the other end thereof is a transversely extending I- beam 173 of same length as the I-beam 172. The securing means for each of said I-beams, consists of vertically disposed bolts 174 extending through the flanges of said beams and also through the plate 98 and carrying 011 their lower ends securing nuts 175. Mounted on the top of the beam 172 is a pair of spaced bearings 176 and 177 which are fixedly maintained in position by the bolts 174 which secure the beam 172 in pos1- tion. Mounted on the top of the beam 173 is a pair of spaced bearings 178, 179 which are fixedly secured in position by bolts 174 employed for securing the beam 173 to the plate 98. V

Arranged on the plate 98, in proximity to the I-beam 172, is a transversely extending, vertically disposed gear casing having its length the same as the width of the plate 98. The casing consists of a lower section 180 flanged as at 181 and extending through such flanges are holdfast devices 182 for fixedly securing the lower section 180 to the plate 98. The upper section of the easing is indicated at 183 and has its bottom flanged as at 184. The flanges of the section 184, sit on flanges 185 at the top of the section 180. Securing devices 186 are provided for detachably connecting the section together and which extend through the flanges 184 and 185.

Journaled in the bearings 178 and 17 6 is a cam shaft 187, extending lengthwise of the plate 98 and further extending through the gear casing between its vertical center and one end thereof. Journaled in the bearings 177, 179 is a cam shaft 188 which extends lengthwise of the plate 98 and further through the gear casing at a point between its vertical center and the other end thereof. Fixed to the shaft- 187 Within the gear casing, is a gear wheel 189 and fixed to the shaft 188, within the gear casing, is a gear wheel 190 which meshes with the gear wheel 189. The connecting of the shafts 187 and 188 together, through the median of the gear wheels 189 and 190, provide for the operation of the shafts simultaneously in opposite directions with respect to each other. The shaft 187,. as well as the shaft 188, is pro vided with a. set of cams corresponding in number to the number of drills or tools of a set. The cams of each set are so disposed as to operate the tools of a set with which they are associated in sequence, that is one after the other, from one end to the other end of the set of drills or tools. The cams of the set carried by the shaft 187 are indicated at 191 and the cams of the set carried by the shaft 188 are indicated at 192. The cams of the shaft 187 are staggered with respect to the cams of the shaft 188. The shaft 187 carries a driven pulley 193, operated through the medium of a belt transmission 194 from a drive pulley 195, carried by the shaft 196, of a motor 197, mounted on a support 198, secured to a pair of channel irons 199, which are fixedly connected to the plates 27 of the sides of the section 2 of the frame of the mobile support. The shaft 196 is provided with a fly wheel 200. The shaft 187 in proximity to the beam 173 carries a fly wheel 201 and the shaft 188, in proximity to the beam 173 carries a fly wheel 202 arranged in a position to clear the fly wheel 201.

Each of the tools of each set, comprises a shank 203 of a length to project above the plate 98 and to depend below the plate 106 and at its lower end terminates in an enlarged beveled cutter 204. The upper end of the shank has a beveled head 205 carrying a right angularly disposed arm 206 impacted by a cam for the purpose of elevating the tool against the action of its spring 137 so that when the cam clears the arm 206 the force of the spring 137, will act, in connection with the weight of the tool to forcefully propel the tool downwardly to act upon the pavement or roadway surface.

The tools of the set with which the cams 191 associate are indicated at 207, 208, 209, 210, 211, 212, 213, 214 and the arms of each of said tools at 215. The tools of the set with which the cams 192 associate are indicated at 216, 217, 218, 219, 220, 221, 222, 223 and the arm of each of said tools at 224. The shanks of the tools 207 to 214 both inclusive extend through the slots 104 and 108. The shanks of tools 216 to 223 inclusive extend through the slots 103 and 107. The slots referred to are formed in the plates 98 and 106. Arranged over the plate 98, at the rear there of, is a pair of spaced vertically disposed supports 225 anchored in position through the median of a pair of angle pieces 26 which are fixedly secured to the plate 98. The tools 208 to 212 inclusive are positioned between said supports 225 and secured to each of said supports 225 is a vertically disposed guide member 226. Extending from one support 225 to the other is a pair of rods 227, 228 one arranged above the other and both extending through the guide members 226. Carried by the rods 227 and 228 is a series of spaced anti-friction rollers 229 for the tools 208 to 212 inclusive. Mounted on the rods 227 and 228 are guide members 230 which are maintained in spaced relation by short barrels 231 mounted on the rods 227. 228. The guide members 230 are of the same construction as the guide members 226. Certain of the guide members 230 are arranged in pairs and between said pairs extend the arms 215 of the tools 209, 210, 211 and 212. The tool or guide members 230 associate with the guide members 226 and between which extends the arms 215 of the tools 208 and 212.

Guide brackets 232 are fixed to the plate 98, extend upwardly thereof, are of yokeshaped contour and associate with the tools 207, 213 and 214.

The tools 217 to 223, both inclusive of the other set of tools as well as the arms 224 of such tools, are guided in the same manner as the tools 208 to 212. The guide members are indicated at 233 and 234 and which are constructed similar to the guide members 226 and 230 and supported in the same manner. The anti-friction rollers for the tools 217 to 223 both inclusive are indicated at A yoke-shaped guide bracket 236 is secured to the plate 98 and associates with the tool 216.

The cams 191, when the shaft 187 is operated, engage under the arm 215 for the purpose of elevating the tools of that set with which said cams associate and as before stated the arrangement of the cams 191 is such that the tools will operate in sequence and the foregoing statement of operation applies to the cams 192 with respect to the tools of that set with which the cams 192 associate. Then the tools of both sets are operated, the tool 207 operates simultaneously with and in a like manner as the tool 216 and this state ment applies to the tools 208 and 217, 209 and 218, 210 and 219, 211 and 220, 212 and 221, 213 and 222, and 21 i and 223.

The construction of the bottom of the tool may be varied to suit the class of surface under treatment so that what is termed the surface loosening mechanism may be employed as a breaker for stone in macadam, bituminous macadam, asphaltic or similar surfaces, or it may be used as a tamper to solidify any surface; or with the machine stationary it may be used to work its way downward through a pavement or other surface for the purpose of trenching, excavating or similar work.

The vertical adjusting of the surface loosening mechanism, from either side of the machine, will cause said mechanism to remain in the same relation to the mobile support constantly, or in other words, the axis of the mechanism is parallel with the transverse axis of the mobile support.

The cutting mechanism, best shown in Figures 1, 1 2, 2 9, 10, 11 and 12 is mounted transversely of the machine between the sides of the mobile support. Before specifically describing the elements of the cutting mechanism it is thought advisable to briefly describe the function and arrangement thereof. The cutting mechanism comprises two batteries of cutting disks, one immediately behind the other. Each battery or disk is so mounted that their passage, when held in contact with the pavement or roadway surface under treatment, will cut or tear up the upper layer of said surface. The disks of each battery are free to revolve about their common axis and each disk is provided with a separate cleaning knife for the purpose of freeing the cutting edge or inside face of each disk from bituminous or other material which might adhere thereto. The

disks are sharpened and of concave shape.

The concave surface of the disk in the front battery faces to the right while the concave side of the disks in the second or rear battery face in an opposite direction. The purpose and effect of this reversal of surface is to equalize laterial pressure and eliminate side thrust, the tendency being to straighten the path of the machine and not thrust it to one side or the other as would be the case were the disks faced in one direction. Each battery of disks is independently adjustable from a vertical standpoint and each battery can be operated alone or both may be operated together. The front battery may be set to penetrate to one depth while the rear batery may be set at a greater depth. The rear battery is so placed in position that the disks thereof operate on lines half way between the two disks immediately in front and forming a part of the front battery thereby insuring that the entire surface of the pave ment or roadway will be processed. The construction of one battery of disks is the same as the other battery, with this exception that the concave disks of the forward battery referred to generally by the reference character 237 are oppositely disposed with respect to the concave disks of the rear bat-- tery referred to generally by the reference character 238. A further difference is that the front battery 237 extends in an opposite inclined plane with respect to the position in which the rear battery 238 is arranged or in other words the battery extends in opposite inclined planes with respect to each other. The front battery 237 extends transversely and forwardly at an inclination with respect to the machine and the rear battery 238 extends transversely and rearwardly at an inclination with respect to the machine. The construction of both batteries is identical, therefore the description of one will apply to the other.

Each battery consists of a series of opposed concave cutting disks 239 of the desired diameter and with the convex face of one disk opposing the concave face of the other throughout. The disks 239, are revolubly mounted on a shaft 2&0 and maintained equi-distant with respect to each other by the spacing collars 241-1 carried by the shaft 240. Each end of the shaft 240 extends into a combined bearing and elevating block therefor and which comprises an inner part 24-2 and an outer part 243 arranged at an angle with respect to the inner part 24:2. The outer part 243 is formed of two sections secured together by holdfast devices 24st and provided with a socket 2&5 for the reception of the shaft 240. he outer part 243, of each of said elevating blocks, has secured thereto by holdfast devices 244, an lip-standing bracket member 246 which projects above the disks 239, as well as projects rearwardly thereto. The 

